Wood-pulp-grinding machine.



Rm nu 9 1 7 V O N D E T N E m A P N E R G L H T. K B 9 1 4 0 00 m N WOODPULP GRINDING MACHINE.

APPLICATION FILED APR. 5, 1905.

1713001030 zerilfiarlfi yre/a W UNITED STATES PATENT OFFICE.

WOOD-PULP-GRINDING MACHINE.

' Specification of Letters Patent.

Patented Nov. '7, 1 905.

Application filed April. 5, 1905. Serial NO; 254 024.

To all whOm it may concern:

tion.

wheel, one or more cylinders having pistons therein subject to apressure thereto and operable to force the billets or portions of woodto be reduced against the grinding-wheel and.

a secondary or auxiliary piston working in a cylinder therefor and inconjunction with ar-j rangements for causing the secondary piston toforce wood to be reduced against the grinding-wheel in intervalsintermediate between the times that the piston or pistons in the primarycylinder or cylinders are main-' taining the wood to the working actionof the grinding-wheel, whereby during a refilling of the wood-receivingchamber or chambers the head of the primary piston or pistons will havegrinding operation carried out on the wood supplied between thesecondary piston and the grinding-wheel to the end of acquiring themaximum of grinding work by utilizing the time requisite for rechargingthe machine with new wood at one place by grinding wood supplied atanother place in the machine.

The object of the invention is to so organ-- ize the machine as toestablish a working pressure by one piston against the wood adjacent aprimary cylinder, at such time retions and arrangements of parts,conduits,

and valves, as hereinafter described in conjunction with theaccompanying drawings Be it known that I, BERNHARD KI LGREN, a subjectof the King of Sweden, and a resi. dent of Holyoke, in the county ofHarnpden 'and State of Massachusetts, have invented: certain new anduseful Improvements in 'W0odPulp-Grindin Machines, of which the;

following is a full, 0 ear, and exact descripfi and set forth in theclaims.

In the drawings, Figure 1 is a side elevation, with important parts incentral vertical section, of a wood-pulp-grinding machine comprising twoprimary cylinders with working piston therein and one secondary cylinderand working piston. Figs. 2

j and 3 are sectional views, on a larger scale,

This invention relates to improvements in a machine or apparatus forgrinding wood for paper-pulp; and the invention espe% cially relates tothat description of machine for the purpose indicated which com-fprises, in combination with a grinding;

of the transfer-valves shown in their different positions relatively toseveral conduits having their unctions at such valve. I

Similar characters of reference indicate corresponding parts in all ofthe views.

In the drawings, A represents a rotary pulp-Wood-grinding wheel inclosedwithin a suitable casing 10 and understood as having Suitable drivingmeans therefor. Adjacent the grinding-wheel is a primary chamberedcasing B for pulp-wood opening endwise to the grinding-wheel, and Crepresents a secondary pulp-Wood chamber, shown as having a locationsimilarly adjacent the grinding-wheel, but in a different radial linefrom the chamber B. The intent is that wood in the chamber B shall beground with as great continuity as possible and with only inter vals ofnon-working as are occasioned for the replenishment of the wood-supplytherein,

while the wood disposed in the SGCOIldZLlY' chamber C is in accordancewith the capability of this machine to have pressure exertedthereagainst, forcing it to the grindingwheel only at such time as thepressure means conjunctive to the primary chamber B is retired andpassive or where there is a plurality of the primary chambers at thetime when the pressure means for one or another of the primary chambersis retired and passive.

In the machine, shown as organized, two of the primary pulp-woodchambers B and 13* are provided with cylinders, pistons, conduits, andvalves, respectively and similarly appurtenant thereto, and in thefurther detailed description the machine will first be set forth in itsaspect of comprising one primary and one secondary pulp-wood chamber,with followers for the pulp-wood and instrumentalities for controllingthe followers, whereby when one is exerting pressure the other ispassive, and vice versa.

Adj oined to and in longitudinal continuation of the chambered pulp-woodcasing B and C are the primary and secondary cylinders D and E, havingpistons F and F respectively, therein with piston shafts or bars G and Gwhich extend through the inner end wall or partition of each cylinderand constitute with the enlargements 12 the followers for the pulp-wood.

By reason of the considerable bulk or cross-sectionalsize of thepiston-bars G G one of the chambers in each cylinder D and E, dividedfrom the other chamber in each cylinder, is of materially-lessenedcrosssec tional area, and thereby the pressure fluid in communication atone time from the same source of pressure-supply will be effective inthe cylinder-chamber a to overpower the opposing pressure in thechamber 1) in the same cylinder, thepressure likewise in chamber a beingeffective normally to overpower the pressure in chamber b of thecylinder E.

The chambers a and a may be properly regarded as working chambers, whilethose I) and b have the functions of retracting or piston-retiringchambers.

In the apparatus .as here shown the source of pressure-supply isrepresented as a reservoir H, understood as having a water-sup ply inlet13 and in which, as commonly done in apparatuses of this generaldescription, a volume of air is maintained at an ample pressure withinthe upper portion of thereservoir and above the water therein. The piped runs from connection with the fluidpressure supply II to theretracting-chamber b of cylinderB, and by a branch d thereof likeconnection is established with the retracting-chamber t in the cylinderE. A.

pipefleadsfrom connection with the-reservoir H to the working chamber aof the primary cylinder D. A pipe g, branching from the conduit f, leadsinto the working chamber a of the secondary cylinder E and adj acent thejunction of the conduit F and pipe g, and there connected by avalve-inclosing fitting 14 is a Waste-pipe h. Within said fittingconnecting the three pipesthat is, g, h, and the two angularly-disposedsections 15 and 16 of the conduit fis the cook J, having the handle 17for operating it and having in the plug or body thereof the ways j and3' and so arranged that open communication may be established from thepressure-supply H to working chamber a, the pipe branch gbeing out ofconnection with the pressure-supply, as represented in Fig. 2,0r that byshifted position of the valve J the sections 15 and 16 of the conduit fWill be closed one from the other, the pipe-section 15 being in open communication with the branch g to give fluidpressure into the workingchamber a of the secondary cylinder simultaneously with the making ofconnection between the section 16 of conduit f and the waste-pipe h.

A pipe 76 is shown as having a branch connecting from the pipe 9 forwaste, here shown as discharging into the pulp channel or canal t andhaving a shut-off cock m.

In operation, the pulp-wood chamber B being charged with the woodbillets or pieces to bereduced to pulp, the secondary chamber C beinglikewise charged, the cock 1% will be closed and the cock J placed inthe position represented in Fig. 2, whereupon the pressure-fluid supplywill have power access from the reservoir into the primary-cylinderworking chamber to overpower the opposing pressure exerted constantlyfrom the same source of supply at the other side of the piston F in thechamber 1), and the communication for pressure in the working chamber aof the secondary cylinder will be suspended. When the wood-supply in thecasing B has been reduced and requires replenishment, the valve J willbe shifted to the position shown in Fig. 3, whereupon pressure inchamber (1 becomes terminated, the pressure constantly maintained inchamber 1). becomes efficient to retire the piston F and the follower G12 to the leftward, and the drainageway is open from working chamber ato the relief or waste pipe h, and simultaneously with these conditionsand actions the fluidpressure has access from the reservoir by way ofconduit-section 15, .valveway j, and pipe 9 into the working chamber aof the secondary cylinder to secure the forcing downward of the followerGr 12for the accomplishment of grinding of the wood in casing 0, whichgrinding will continue while pulp-wood chamber B is being replenished,and then when the valve J is shifted back to the position of Fig. 2 thegrinding of the wood in casing B will be resumed and the grinding actionin casing C will be substantially discontinued. In order, however, thatso soon as the valve J is shifted from the position of Fig. 3 to that ofFig. 2-there will be an instant of open communication between theworking chamber a of the secondary cylinder E and the waste-pipe h byway of the pipe 9 to slightly relievethe pressure on-the follower of thepistonF the cock J is shown as'having in addition to the ways j and jthe third somewhat restricted way 3' which during the shifting ortransitory movement of the cock opens communication between pipe (1 andwaste-pipe-h. In this way there is a slight letting up of thefollower-head 12 of the piston-shaft G suflicient to.compensate for theelasticity of the wood in the cas ing C, and so that when thewood-forcing motor comprised in the parts D and B resumes its work suchresumption may be accomplished without shock or violence in the machine.I

Of course there will be times when the piston F in the secondarycylinder must be-fully retired, correspondingly fully withdrawing thefollower-head for taking a new supply of pulp-wood into the secondarychamberC, and this may be performed by setting the cock J over to theposition ofFig. 2 and opening the shut-0H cock m in the drainage branchpipe 7c, whereupon, as manifest, a discharge-way is established forwithdrawal of the fluid from the working chamber a and theconstantly-maintained fluid-pressure in the retracting-chamber 6 becomesefficient for the retirement of the piston F and its follower.

Having now described the organization in the machine of the primarymotor and a sec ondary motor operable relatively to the commongrinding-wheel for accomplishing a constant wood-grinding, whether it beat a given time of the billets pressed against the stone by the primarymotor or by the secondary motor, it becomes easily apparent thatduplication of the primary motor and of its conjunctive conduits andvalve equipments, whereby it is likewise cooperative with those of thesecondary motor, is a matter of additional provision with no extension,so far as the invention is concerned, of the idea of means, and so inthe machine here illustrated primary motors for simultaneous action areincluded at the right-hand as well as at the left-hand side of themachine, in such a way that when either one is rendered temporarilyinactive loss-saving action becomes instantaneously established in andby the secondary motor.

In this wood-grinding apparatus there is as components of all of theinstrumentalities and for the establishment of all of the conditions andthe performance of all of the actions described an unusually few partsand appliances. It is also true that none of the water effectivelyutilized in the chambers a b for the retirement of the pistons andfollowers ever goes to waste, and while the contraction of the cylinderarea in the chambers a b by the presence in such chambers only of thepiston-shafts enables the employment of motor fluid from a common sourceand at the pressure at which it may be found in connection with theretracting-chambers, as well as with the working chambers a b, theeffectiveness of the motive fluid becoming variable by reason of thedifferences in the cylinder areas, this invention is not to be limitedin all respects to this highly-desirable, though non-essential,arrangement, for it is quite practicable to effect the retirement of thepiston by having the retractingchambers in connection with a source oflowpressure supply.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a wood-pulp-grinding machine, a grinding-wheel, primary andsecondary casings for the wood, said casings being endwise open adjacentthe wheel, and cylinders, combined with said casings, having pistonstherein, dividing the cylinders into working and retracting chambers,and followers, connected with the piston-shafts and located in thewood-chambers, a source of pressure-supply, and pipes extendingtherefrom to the retracting-chambers in both cylinders, a conduitconnecting said supply and the working chamber of the primary cylinder,a conduit branching from the aforenamed conduit and connecting into theworking chamber of the second cylinder, and a pipe branching from saidfirst-named conduit for waste, and said branching pipes having, inconnection therewith and at their junction, a valve having plural ways.

2. In a woodpulpgrinding machine, a grinding-wheel, primary andsecondary casings for the wood, said casings being endwise open adjacentthe wheels, and cylinders, combined with said casings, having pistonstherein, dividing the cylinders into working and retracting chambers,and followers, connected with the piston-shafts and located in thewood-chambers, a source of pressuresupply, and pipes extending therefromto the retracting-chambers in both cylinders, a conduit connecting saidsupply and the working chamber of the primary cylinder, a conduitbranching from the aforenamed conduit and connecting into the workingchamber of the second cylinder, and a pipe branching from saidfirst-named conduit for waste, and said branching pipes having, inconnection therewith and at their junction, a valve having plural ways,and a waste-pipe, in communication with the second cylinder workingchamber, having a cock.

3. In a wood-pulp-grinding machine, a grinding-wheel, primary andsecondary casings for the wood, which are endwise open adjacent thewheel, and cylinders, combined with said casings, having pistonstherein, di viding the cylinders into working and retracting chambers,and followers, connected with the piston-shafts and located in thewood-chambers, a source of pressure-supply, and pipes extendingtherefrom to the retractingchambers in both cylinders, a conduitconnecting said supply and the working chamber of the primary cylinder,a conduit branching from the aforenamed conduit and. connecting into theworking chamber of the second cylinder, and a pipe branching from saidfirst-named conduit for waste, and said branching. pipes having, inconnection therewith and at their junction, a valve having the ways, j jand having a way 7' for giving in its shifting movements an instant ofcommunication between the conduits g and h for a slight relief of theestablished pressure in the second cylinder working chamber for thepurpose set forth.

4. In a wood-pulp-grinding machine, a grinding-wheel, a chamberedWood-receiving casing and an adjoined cylinder having a piston thereinand a piston bar or shaft extending from one side of the piston, intothe Wood-chamber and carrying a wood-follower and said. piston-shaft, bythe presence of its portion within the cylinder to the one side of thepiston, establishing a cross-sectional cylinder area less than thecylinder area at the other side of the piston, a source ofpressure-supply and conduits extending therefrom to the full sized andreduced chambers in the cylinder, means for shutting oil the fluidsupply connection with the working chamber of the cylinder and means foropening said chamber for relief or waste.

5. In a wood-pulp-grinding machine, a grinding-wheel A, primary andsecondary casings B, C, for the Wood, which are endwise open adjacentthe wheel, and cylinders, D, E, combined with said casings, havingpistons F, F, therein, dividing the cylinders into working andretracting chambers a b, (L b and followers, G G connected with thepiston-shafts and located in the wood-chambers, a source ofpressuresupply, H, and pipes d (1 extending therefrom to theretracting-chambers in both cylinders, a conduit f connecting saidsupply H and the working chamber a of the primary cylinder, a conduit 9branching from the aforenamed conduit f and connecting into the workingchamber a of the second cylinder, a pipe 7t branching from conduit fforwaste, and said branching pipes f g it having, in connection therewithand at their junction, a valve J having plural ways 3' j and said valvealso having the way j to give, in the valve-shifting movement, aninstant of communication, for pressure-relief, between working chamber aand waste-pipe h, and a pipe 76, leading from said conduit 9 between thevalve J and the second cylinder working chamber, having a cock m,therein.

Signed by me at Springfield, Massachusetts, in presence of twosubscribing wit nesses.

BERNHARD KIHLGREN.

Witnesses: 4

WM. S. BnLLows, G. R. DRISCOLL.

